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=9x^2-64y^2
2.70+30y-21y-9y^2= 70+9y-9y^2
3.(5x)^2 + 2*5x*6y + (6y)^2
=25x^2 + 60xy + 36y^2
4.(6x)^2 - 2*6x*9y + (9y)^2
=36x^2 - 108xy + 81y^2
5.